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Diffstat (limited to 'layout/style/test/test_reframe_input.html')
| -rw-r--r-- | layout/style/test/test_reframe_input.html | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/layout/style/test/test_reframe_input.html b/layout/style/test/test_reframe_input.html new file mode 100644 index 0000000000..2887548abf --- /dev/null +++ b/layout/style/test/test_reframe_input.html @@ -0,0 +1,48 @@ +<!doctype html> +<meta charset="utf-8"> +<title>Test for bug 1658302: We don't reframe for placeholder attribute value changes.</title> +<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez"> +<script src="/tests/SimpleTest/SimpleTest.js"></script> +<input id="input"> +<textarea id="textarea"></textarea> +<script> +SimpleTest.waitForExplicitFinish(); +const utils = SpecialPowers.DOMWindowUtils; + +function expectReframe(shouldHaveReframed, callback) { + document.documentElement.offsetTop; + const previousConstructCount = utils.framesConstructed; + const previousReflowCount = utils.framesReflowed; + + callback(); + + document.documentElement.offsetTop; + isnot(previousReflowCount, utils.framesReflowed, "We should have reflowed"); + (shouldHaveReframed ? isnot : is)(previousConstructCount, + utils.framesConstructed, + `We should ${shouldHaveReframed ? "" : "not"} have reframed`); +} + +for (const control of document.querySelectorAll("input, textarea")) { + // Creating the placeholder attribute reframes right now. + // + // TODO: Could be avoided with some more work. + expectReframe(true, () => { + control.placeholder = "foo"; + }); + + // Incrementally changing it should not reframe, just reflow. + expectReframe(false, () => { + control.placeholder = "bar"; + }); + + // Removing the placeholder attribute reframes right now. + // + // TODO: Could maybe be avoided with some more work. + expectReframe(true, () => { + control.removeAttribute("placeholder"); + }); +} + +SimpleTest.finish(); +</script> |